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Existing deep learning-based modulation recognition methods are difficult to adapt to HF channels with significant time-varying characteristics, limiting their application in modulation recognition for High Frequency (HF) signals. In addition, in non-cooperative HF communication scenarios, the training dataset is often difficult to cover all possible modulation types, so that open-set modulation recognition also has important practical significance. This paper proposes a multi-modal feature fusion-based open-set modulation recognition method by combining communication domain knowledge and open-set recognition techniques,which effectively reduces the impact of time-varying HF channels and unknown modulation types on recognition performance. The proposed method first utilizes communication domain knowledge to obtain multimodal features that are robust to channel variations,and then extracts discriminative deep feature representations through multimodal feature fusion and deep feature learning to effectively identify known and unknown modulation types. In addition, the method also generates dummy samples through manifold mixing strategy to assist network training, which can enhance the network's ability to identify unknown types. Experimental results indicate that the proposed method outperforms existing open-set modulation recognition methods. When the channel conditions of training and testing signals are the same, the proposed method improves by over 3% in open-set recognition performance. When the channel condition of testing signals is drastically changed, that is, the channel conditions of the training and testing signals are different,the proposed method improves by over 8% compared to existing method, which exhibits strong robustness to channel variations.
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现有基于深度学习的调制识别方法难以适应具有显著时变特性的短波信道,限制了其在短波信号调制识别中的应用。此外,在非合作短波通信场景中,训练数据集通常难以覆盖所有可能出现的调制类型,因而开集调制识别具有重要应用价值。本文结合通信领域知识和开集识别技术,提出了一种基于多模态特征融合的短波信号开集调制识别方法,有效缓解了短波信道时变性和未知调制类型对识别性能的影响。所提方法首先利用通信领域知识获得对信道变化具有鲁棒性的多模态特征,随后通过多模态特征融合和深度特征学习来提取具有判别性的深度特征表示,从而有效地识别已知和未知调制类型。此外,还通过流形混合策略生成混淆数据作为虚拟样本辅助网络训练,以提高网络对未知类型的识别能力。实验结果表明:所提方法优于现有的开集调制识别方法。当训练与测试信号的信道条件相同时,其开集识别性能有3%以上的性能提升;当测试信号的信道条件发生剧烈变化,即训练与测试信号的信道条件不同时,其性能较现有方法提高了8%以上,对信道变化表现出较强的鲁棒性。
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林皇 1993年生,博士研究生。
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林皇 1993年生,博士研究生。
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戴旭初 1963年生,教授,博士生导师。
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戴旭初 1963年生,教授,博士生导师。
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2016: 1563-1572., articleTitle=Towards open set deep networks, refAbstract=null)], funds=[Fund(id=1239158387066327668, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, awardId=61971391, language=CN, fundingSource=国家自然科学基金(61971391), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1239158381836030362, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, xref=null, ext=[AuthorCompanyExt(id=1239158381844418971, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, companyId=1239158381836030362, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=University of Science and Technology of China, Hefei 230026, China), AuthorCompanyExt(id=1239158381848613276, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, companyId=1239158381836030362, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中国科学技术大学 合肥 230026)])], figs=[ArticleFig(id=1239158383626998280, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Fig. 1, caption=
Structure of proposed method, figureFileSmall=ZYEE5sFi2a83By8C2GjHBw==, figureFileBig=sX//cJs2hDKB1jIfwvPOGg==, tableContent=null), ArticleFig(id=1239158383777993230, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=图1, caption=
所提方法的基本结构, figureFileSmall=ZYEE5sFi2a83By8C2GjHBw==, figureFileBig=sX//cJs2hDKB1jIfwvPOGg==, tableContent=null), ArticleFig(id=1239158384038040090, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Fig. 2, caption=
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残差卷积层的结构, figureFileSmall=4VJj6WpClL5QckL2Im/gkQ==, figureFileBig=M+dNeaNQ7L4VNyRh5nbKcg==, tableContent=null), ArticleFig(id=1239158385640264230, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Fig. 3, caption=
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不同信噪比下识别性能对比, figureFileSmall=4I03xyIuXf9QS1nDc1L0wQ==, figureFileBig=DxjY/7kPyryrKOf4OOgKSw==, tableContent=null), ArticleFig(id=1239158385933865533, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Table 1, caption=
Detailed parameters of HFMS dataset
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| 数据集 | HFMS数据集 |
|---|
| 信道模型 | Watterson信道模型 |
| 纬度条件 | 低纬度、高纬度 |
| 电离层状态 | 安静条件、扰动条件 |
| 信噪比范围 | 0 dB~20 dB,间隔2 dB |
| 信号格式 | IQ复信号,2×9600 |
| 信号样本总数 | 1 320 000个信号 |
| 调制类型 | 数字调制:BPSK,QPSK,8PSK,8QAM,16QAM,OQPSK,GFSK,CPFSK,OOK,4PAM,8PAM,2FSK,4FSK,8FSK,16FSK 模拟调制:PM,WB-FM,AM-SSB,AM-DSB-WC,AM-DSB-SC |
), ArticleFig(id=1239158386005168702, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=表1, caption=
HFMS数据集的详细参数
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| 数据集 | HFMS数据集 |
|---|
| 信道模型 | Watterson信道模型 |
| 纬度条件 | 低纬度、高纬度 |
| 电离层状态 | 安静条件、扰动条件 |
| 信噪比范围 | 0 dB~20 dB,间隔2 dB |
| 信号格式 | IQ复信号,2×9600 |
| 信号样本总数 | 1 320 000个信号 |
| 调制类型 | 数字调制:BPSK,QPSK,8PSK,8QAM,16QAM,OQPSK,GFSK,CPFSK,OOK,4PAM,8PAM,2FSK,4FSK,8FSK,16FSK 模拟调制:PM,WB-FM,AM-SSB,AM-DSB-WC,AM-DSB-SC |
), ArticleFig(id=1239158386089054786, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Table 2, caption=
Specific parameter settings of proposed method
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| 参数 | 值 |
|---|
| 边际松弛裕度(m) | 0.25 |
| 特征向量维度(d) | 512 |
| 尺度因子(γc) | 128 |
| 类内样本数目(Np) | 32 |
| 类间样本数目(Nn) | 64 |
| 虚拟分类器权重(β) | 0.1 |
| 分类损失权重(λc) | 1.0 |
| 原型学习损失权重(λp) | 0.5 |
| 虚拟样本损失权重(λu) | 0.5 |
), ArticleFig(id=1239158386172940872, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=表2, caption=
所提方法的具体参数设置
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| 参数 | 值 |
|---|
| 边际松弛裕度(m) | 0.25 |
| 特征向量维度(d) | 512 |
| 尺度因子(γc) | 128 |
| 类内样本数目(Np) | 32 |
| 类间样本数目(Nn) | 64 |
| 虚拟分类器权重(β) | 0.1 |
| 分类损失权重(λc) | 1.0 |
| 原型学习损失权重(λp) | 0.5 |
| 虚拟样本损失权重(λu) | 0.5 |
), ArticleFig(id=1239158386252632650, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Table 3, caption=
Experimental results of different methods
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| 方法 | CCA | AUROC | OSCR |
|---|
| DEVT | 91.5% | 86.0% | 83.3% |
| FSSL | 92.0% | 87.4% | 84.6% |
| MMPRF | 92.2% | 90.1% | 87.1% |
| 本文方法 | 94.3% | 92.8% | 90.5% |
), ArticleFig(id=1239158386323935823, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=表3, caption=
不同方法的实验结果
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| 方法 | CCA | AUROC | OSCR |
|---|
| DEVT | 91.5% | 86.0% | 83.3% |
| FSSL | 92.0% | 87.4% | 84.6% |
| MMPRF | 92.2% | 90.1% | 87.1% |
| 本文方法 | 94.3% | 92.8% | 90.5% |
), ArticleFig(id=1239158386420404820, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Table 4, caption=
Experimental results under different channel conditions
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| 方法 | 低纬度 扰动条件 | 高纬度 安静条件 | 高纬度 扰动条件 |
|---|
| DEVT | 79.4% | 81.6% | 76.0% |
| FSSL | 80.6% | 82.8% | 77.4% |
| MMPRF | 83.6% | 85.4% | 80.7% |
| 本文方法 | 87.7% | 89.1% | 85.2% |
), ArticleFig(id=1239158386533651032, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=表4, caption=
不同信道条件下的实验结果
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| 方法 | 低纬度 扰动条件 | 高纬度 安静条件 | 高纬度 扰动条件 |
|---|
| DEVT | 79.4% | 81.6% | 76.0% |
| FSSL | 80.6% | 82.8% | 77.4% |
| MMPRF | 83.6% | 85.4% | 80.7% |
| 本文方法 | 87.7% | 89.1% | 85.2% |
), ArticleFig(id=1239158386621731422, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Table 5, caption=
Effect of channel condition changes on recognition performance
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| 方法 | LQ→HD | HD→LQ |
|---|
| AUROC | OSCR | AUROC | OSCR |
|---|
| DEVT | 70.2% | 67.1% | 78.1% | 75.8% |
| FSSL | 71.5% | 68.7% | 78.7% | 76.7% |
| MMPRF | 74.8% | 72.4% | 82.8% | 79.8% |
| 本文方法 | 83.7% | 81.1% | 89.6% | 87.1% |
), ArticleFig(id=1239158386714006115, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=表5, caption=
信道条件变化对识别性能的影响
, figureFileSmall=null, figureFileBig=null, tableContent=
| 方法 | LQ→HD | HD→LQ |
|---|
| AUROC | OSCR | AUROC | OSCR |
|---|
| DEVT | 70.2% | 67.1% | 78.1% | 75.8% |
| FSSL | 71.5% | 68.7% | 78.7% | 76.7% |
| MMPRF | 74.8% | 72.4% | 82.8% | 79.8% |
| 本文方法 | 83.7% | 81.1% | 89.6% | 87.1% |
), ArticleFig(id=1239158386831446633, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=EN, label=Table 6, caption=
Comparison of ablation experiment results
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| 方法 | CCA | AUROC | OSCR |
|---|
| IQ-MRN | 92.7% | 90.7% | 88.1% |
| SDC-MRN | 93.8% | 91.7% | 89.3% |
| NGU-MRN | 93.6% | 91.5% | 88.7% |
| 本文方法 | 94.3% | 92.8% | 90.5% |
), ArticleFig(id=1239158386957275760, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158368489754638, language=CN, label=表6, caption=
消融实验结果对比
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| 方法 | CCA | AUROC | OSCR |
|---|
| IQ-MRN | 92.7% | 90.7% | 88.1% |
| SDC-MRN | 93.8% | 91.7% | 89.3% |
| NGU-MRN | 93.6% | 91.5% | 88.7% |
| 本文方法 | 94.3% | 92.8% | 90.5% |
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